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    if(  SpokenTo()  ) {
       Speak();
    }

sub Speak {
    return unless SpokenTo();
    # ...
}

sub Speak {
    return   if ! SpokenTo();
    # ...
}

DontSpeak()  unless SpokenTo();
DontSpeak()  if ! SpokenTo();

    unless( SpokenTo() ) dont {
        Speak();
    }